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Priority to FI871555ApriorityCriticalpatent/FI78952C/en
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Publication of FI871555ApublicationCriticalpatent/FI871555A/en
Publication of FI78952BpublicationCriticalpatent/FI78952B/en
Application grantedgrantedCritical
Publication of FI78952CpublicationCriticalpatent/FI78952C/en